import sys
sys.path.append("D:\Python练习")

from car import Car


class Battery():
    """一次模拟电动汽车电瓶的简化尝试"""

    def __init__(self,battery_size=70):
        """初始化电瓶的属性"""
        self.battery_size=battery_size

    def describe_battery(self):
        """打印一条描述电瓶容量的消息"""
        print("This car has a "+str(self.battery_size)+"-kwh battery.")

    def get_range(self):
        """打印一条消息，指出电瓶的续航里程"""
        if self.battery_size==70:
            range=240
        elif self.battery_size==85:
            range=270



        message="This car can go approximately "+str(range)
        message+=" miles on a full charge."
        print(message)

class ElectricCar(Car):
    """电动汽车的独特之处"""

    def __init__(self,make,model,year):
        """初始化父类的属性"""
        super().__init__(make,model,year)


        self.battery=Battery()